CN102573121B - Wireless Mesh router - Google Patents
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Abstract
The invention relates to a wireless Mesh router, belonging to wireless communication equipment. The wireless Mesh router comprises a wireless network card, a data processing part and a 10M/100M network interface, wherein a network processing chip of the data processing part is used as a main controller, an external RAM (Random Access Memory) and a Flash chip are sued for storing programs and temporarily storing data, and an FPGA (Field Programmable Gate Array) chip and wireless network card communication process and send network data packets to the network processing chip; and the 10M/100M network interface outputs obtained wireless data and inputs data requiring forwarding. The wireless Mesh router enables networking to be completed quickly and effectively and is applicable to users to build a large-scale wireless Mesh network. The design of redundant routes can ensure that normal data transmission can not be influenced under the condition that individual route is damaged or fails, the antijamming capability and the bandwidth stability of a wireless link layer are increased, and the limited frequency spectrum resource is saved. The wireless Mesh router is combined with a wireless sensor network node, which is convenient for function expansion.
Description
Technical field
The present invention relates to a kind of Wireless Mesh router, belong to Wireless Telecom Equipment, specially refer to a kind of networking and method for routing of wireless Mesh netword.
Background technology
Along with the high speed development of wireless communication technology and Internet, merge the two and realize Mobile Internet and become current study hotspot.Therefore wireless Mesh netword (Wireless Mesh Networks, claims again wireless mesh network, wireless mesh network etc.) also obtains people's concern more and more.Wireless Mesh netword is a kind of new network structure based on multi-hop route, peer-to-peer network technology, has the characteristic of mobile broadband.It is by Ad-Hoc network (a kind of wireless multi-hop network) development and change, has followed Ad-Hoc network dynamic expansion, MANET, self-configuring, the good characteristic such as management and self-healing certainly.
Wireless Mesh router of the present invention, utilize multimode technology thoroughly to solve Wireless Mesh multi-hop loss problem, and the standard technique that adopts multiple advanced person wireless performance such as transmission range, rate travel, anti-interference, the aspect such as penetrate and wireless network secure aspect significantly improves, support complicated or to carrying out the business such as Wireless Data Transmission, wireless video picture control, IP video conference, IP audio frequency and video phone, wireless location, wireless numerical under the high environment of safety requirements.
Summary of the invention
The technical problem to be solved in the present invention is a kind of Wireless Mesh router of design, can increase and decrease module according to user's networking application, and each module can flexible configuration become AP module, passback module or high-power passback module.Should possess distributed multihop function, allow automatically adding of nodes, accessible the Internet, can realize rapidly wireless coverage.
The solution that the present invention adopts is as follows:
This Wireless Mesh router comprises wireless network card, data processing section and three parts of 10M/100M network interface.The network processes chip of data processing section is as master control, extend out RAM and Flash chip for the storage of program and keeping in of data, fpga chip is issued network processes chip after communicating by letter with wireless network card network packet being processed, thereby reduce the load of network processes chip, speeding up data transmission speed.10M/100M network interface can and need the data input forwarding by the wireless data output of obtaining.
The protocol specialized running on network processes chip is the design of Wireless Ad-hoc Mesh net.This agreement belongs to Active Routing Protocol in Active, all nodal informations that can pass through single-hop or multi-hop link communication in active maintenance Mesh net.Core strategy is from single-hop neighbor node, to choose the optimal node that an energy and destination node communicate.In order to realize IP-based multi-hop route, the routing table of node also must comprise a gateway node for connecting Internet.
Each router node is found message NDMgs(Node Discover Messages by sending and receiving node) realize the foundation of routing table, the quantitative analysis of link communication matter, and then realize route.The information that NDMgs comprises is version, life span (TTL), gateway sign (GWFlags), gateway port, sequence number, the IPv4 address of node.As shown in table 1 below.
Table 1: node is found message data packet format
NDMgs packet is totally 10 bytes, and wherein version is version number, 4 bits; Life span (TTL), 8 bits, can be used for defining the upper limit of jumping figure; Gateway sign (GWFlags), 8 bits, if node can accessing Internet, it can be used as an Internet gateway so, it is to describe the parameter (up-downgoing speed etc.) that network connects that GWFlags is set, if node does not provide the Internet access, it must set GWFlags is 0; Gateway port, 8 bits, the port that define grid connects; Sequence number, 16 bits, the serial number of NDMgs, each new NDMgs sequence number increases by 1; Node address, 32 bits, the IPv4 address of node.
In networking process each router node for network in the following information of other node maintenances: IPv4 address, sequence number.If this node provides an internet gateway, need to record its parameter.Set up neighbor information list, the sliding window in list is used for recording the sequence number of several NDMgs that receive, and packet counting is used for recording the number of the NDMgs receiving, and up-to-date ttl field is used for recording the TTL of the NDMgs receiving recently.
Each node must regularly generate and broadcast NDMgs.During transmission, each field of NDMgs message is set according to self information.After receiving NDMgs, first will detect NDMgs version and send address information, if version is different from self, or its sender address is identical with self address, and this NDMgs must be dropped so.According to sender address, set up afterwards or renewal respective neighbours information list list item.Also need two of the communication signal intensity (RSSI/RSI) of comprehensive transmit leg and the packet loss (last_rx) of prediction, after elapsed time integration, (maximum 255 represents that current link communication is best in quality to be quantified as link communication quality, minimum value 0, represent that current link communication quality is the poorest), in order to select best next-hop node.After finally the ttl field of this NDMgs being subtracted to 1, if be not equal to 0, so by its replay.
The process of safeguarding communication routing table also can be directly and the link communication mass value of the adjacent node (single-hop) of self communication, and the NDMgs information of other nodes of receiving is included in self NDMgs and is sent to adjacent node.During routing, the communication quality of the multilink that arrives destination node is done to loss accumulative total, select the path of loss minimum, as the optimal path that arrives destination node, to realize multi-hop function.The route of cleaning inefficacy in time simultaneously.
If node can accessing Internet, so node just by NDMgs to the own gateway for access of statement in network.The broadcasting packet of node has comprised describes connection upstream and downstream rate parameter etc.Also send one and be used for the port numbers of UDP passage of setting up.
64 or 128 s' AES cipher mode is used in wireless telecommunications, and all communication informations and NDMgs information are all encrypted transmission, and wireless router can be operated in the mode of 802.11a/b/g.
Effect of the present invention and benefit are:
(1) the best down hop that gets target is the core of algorithm, analyzes the communication quality of link mainly by protocol data packet loss and propagation velocity have been added up, and networking can be completed fast and effectively.
(2) multi-hop networking, applicable user is set up large-scale wireless Mesh netword.The design of redundancy route can guarantee, in the situation that having indivedual router nodes damages or fault, not affect normal transfer of data.
(3) mac-layer protocol of optimizing, antijamming capability and the bandwidth stability of raising radio link layer, save limited frequency spectrum resource.
(4) combine with wireless sensor network node, conveniently carry out Function Extension, such as: increase the transducers such as temperature, humidity, wind speed, wind direction, rainfall, can carry out omnibearing monitoring to target area.
(5) use waterproofing design, reserved waterproof power interface, network interface and antennal interface, constructability, installment and debugging.
Accompanying drawing explanation
Accompanying drawing is wireless router structure chart.
Embodiment
Below in conjunction with technical scheme and accompanying drawing, describe the specific embodiment of the present invention in detail.
Embodiment: technical scheme of the present invention, the network processes chip of the data processing section of this Wireless Mesh routing device is selected Atheros ar7130, this chip has MIPS24K core, processing speed is 300MHz, RAM adopts the 32MB SDRAM of Nanya company, Flash chip adopts the Flash of the 64MB of HYNIX company, fpga chip is selected the xc9536xl of Xilinx company, xc9536xl system clock can reach 178MHz, 34 of I/O ports, 36 of macrocells, communicate by letter with AR5413 wireless network card by miniPCI interface.The transmission speed of data can 1Mbps, 2Mbps, manual switchover or automatic switchover between 5.5Mbps, 11Mbps, 6Mbps, 9Mbps, 12Mbps, 18Mbps24Mbps, 36Mbps, 48Mbps, 54Mbps, 108Mbps, and WEP, AES, AES_CCM, TKIP encryption mode are supported in wireless telecommunications.
In order to increase the range of application of this Wireless Mesh router, at interface and shell design aspect, select multiple Ethernet electricity mouths, single mode optical interface, multi-mode optical interface, ATM mouth.Provide and the interface of sensor network, adopt integrated structure design, reach the degree of protection of IP66.Built-in ethernet lightning protection, power lightning protection, each assembly all adopts automobile electric sub level device.External interface adopts aviation-grade connector, guarantees that reliable power supply is connected with network.Attach mounting kit, can support to hang wall and install, embrace cross bar installation, embrace montant installation.Subsidiary Special sun plate, to guarantee equipment steady operation in high temperature burning sun situation.Supply power mode, interchange, direct current, POE, solar energy, wind energy are optional.Make this invention can be widely used in wireless video monitoring, harbour, oil field, goods yard, wireless campus, wireless city, the fields such as emergency communication.
Claims (1)
1. a Wireless Mesh router, is characterized in that, this Wireless Mesh router comprises wireless network card, data processing section and three parts of 10M/100M network interface; The network processes chip of data processing section is as master control, extend out RAM and Flash chip for the storage of program and keeping in of data, fpga chip is issued network processes chip after communicating by letter with wireless network card network packet being processed, and reduces the load of network processes chip, speeding up data transmission speed; 10M/100M network interface is by the wireless data output of obtaining and need the data input forwarding;
Each router node finds that by sending and receiving node message NDMgs realizes the foundation of routing table, the quantitative analysis of link communication matter, and then realize route; The information that NDMgs comprises is the IPv4 address of version, life span (TTL), gateway sign (GWFlags), sequence number, node; As shown in table 1 below:
Table 1: node is found message data packet format
NDMgs packet is totally 10 bytes, and wherein version is version number, 4 bits; Life span (TTL), 8 bits, are used for defining the upper limit of jumping figure; Gateway sign (GWFlags), 8 bits, if node accessing Internet, it is as an Internet gateway so, it is to describe the parameter that network connects that GWFlags is set, if node does not provide the Internet access, it must set GWFlags is 0; Gateway port, 8 bits, the port that define grid connects; Sequence number, 16 bits, the serial number of NDMgs, each new NDMgs sequence number increases by 1; Node address: 32 bits, the IPv4 address of node;
In networking process each node for network in the following information of other node maintenances: IPv4 address, sequence number, if this node provides an internet gateway, records its parameter; Set up neighbor information list, the sliding window in list is used for the sequence number of several NDMgs of receiving of record, and packet counting is used for the number of the NDMgs that record receives, and up-to-date ttl field is used for the TTL of the NDMgs that records nearest reception;
Each node must regularly generate and broadcast NDMgs; During transmission, each field of NDMgs message is set according to self information; After receiving NDMgs, first will detect NDMgs version and send address information, if version is different from self, or its sender address is identical with self address, and this NDMgs must be dropped so; According to sender address, set up afterwards or renewal respective neighbours information list list item; Also need two of the communication signal intensity (RSSI/RSI) of comprehensive transmit leg and the packet loss (last_rx) of prediction, after elapsed time integration, be quantified as link communication quality, in order to select best next-hop node; After finally the ttl field of this NDMgs being subtracted to 1, if be not equal to 0, so by its replay;
If node can accessing Internet, so node just by NDMgs to the own gateway for access of statement in network; The broadcasting packet of node has comprised describes connection upstream and downstream rate parameter; Also send one be used for set up UDP tunnel ends slogan;
64 or 128 s' AES cipher mode is used in wireless telecommunications, and all communication informations and NDMgs information are all encrypted transmission, and wireless router is operated in the mode of 802.11a/b/g.
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| CN103761851A (en) * | 2014-01-21 | 2014-04-30 | 柳州市锋威汽车科技有限公司 | Intelligent monitoring system for oil spilling at port |
| CN104808566A (en) * | 2015-05-06 | 2015-07-29 | 深圳市菲菱科思通信技术有限公司 | Indoor monitoring system based on AP (access point) panels and wireless ad hoc networks |
| CN111614557B (en) * | 2020-04-02 | 2021-09-24 | 深圳创维－Rgb电子有限公司 | Data transmission method and device of Mesh network, gateway and storage medium |
| CN111983146A (en) * | 2020-08-17 | 2020-11-24 | 三河市清源绿创环境技术股份有限公司 | Motor vehicle exhaust monitoring system |
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| CN101453794A (en) * | 2008-11-21 | 2009-06-10 | 西安交通大学 | Mobile Ad Hoc network terminal based on 802.11b/g and implementation method thereof |
| CN101488896A (en) * | 2008-01-18 | 2009-07-22 | 深圳市格林威视科技开发有限公司 | Wireless access point and constructed MESH network |
| CN101867920A (en) * | 2010-02-09 | 2010-10-20 | 利尔达科技有限公司 | Grading type wireless sensor networking method |
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| CN101488896A (en) * | 2008-01-18 | 2009-07-22 | 深圳市格林威视科技开发有限公司 | Wireless access point and constructed MESH network |
| CN101453794A (en) * | 2008-11-21 | 2009-06-10 | 西安交通大学 | Mobile Ad Hoc network terminal based on 802.11b/g and implementation method thereof |
| CN101867920A (en) * | 2010-02-09 | 2010-10-20 | 利尔达科技有限公司 | Grading type wireless sensor networking method |
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